With the arrival of season 15 of "Grey's Anatomy," you might be needing a season 14 refresher.

This show has such a huge cast and so much drama that it's often hard to know who's who and what's what. That being said, before you dive in head-first to what our favorite surgeons are up to in Season 15, there are a few details you might want to brush up on first.

Here are 10 things you should know before watching the new season of "Grey's Anatomy."

1/

April Kepner left the show.

Sarah Drew, who plays April Kepner, left the show.
ABC

Season 14 of "Grey's Anatomy" saw the official end of April Kepner and Jackson Avery's relationship and the rekindling of April and her previous boyfriend, Matthew's. Toward the end of the season, April was in a car wreck with Matthew and almost died, but she woke up as soon as she heard Jackson praying for her.

The season ended with her and Matthew getting married at Alex and Jo's wedding.

ABC announced that Sarah Drew, who plays April Kepner, would be leaving the series, which some thought to be the result of a scandal until co-star Ellen Pompeo said otherwise.

And so did Arizona.

Arizona moved to New York.
ABC

After realizing that Sophia, Arizona Robbins and Callie Torres' daughter, needed her moms in the same place, Arizona moved to New York. Fans believe the move might lead to a rekindled relationship between Arizona and Callie.

ABC, however, announced that Jessica Capshaw, who plays Arizona, will be leaving the show alongside Sarah Drew.

"The characters of Arizona and April are permanently woven into the fabric of 'Grey's Anatomy' thanks to the extraordinary work of Jessica Capshaw and Sarah Drew," Krista Vernoff, co-showrunner, said. "As writers, our job is to follow the stories where they want to go and sometimes that means saying goodbye to characters we love. It has been a joy and a privilege to work with these phenomenally talented actresses."

3/

Meredith and Riggs ended their relationship.

Meredith struggled to move on from Derek in season 14.
ABC

In season 14, Meredith's relationship with Riggs, a cardiothoracic surgeon who worked with April Kepner during her time in Jordan, ended after Riggs' ex-girlfriend and Owen's sister, Megan Hunt, was found alive. Meredith tried to resign from dating altogether, but at the same time, she realized that she had to find a way to move on from Derek.

In a heartbreaking scene, Meredith put Derek's scrub cap and their framed marriage Post-It away in a drawer.

4/

Jackson and Maggie became an official couple.

Fans were shocked to see Jackson move on from April.
ABC

After a long lead up, Jackson Avery and Maggie Pierce solidified their relationship in season 14.

"There are definitely still traces of April in his life. There's still Harriet there," McCreary told Entertainment Tonight.

She added that Maggie and Jackson are a new relationship so there's a lot that's still up in the air.

"They're new and so it's still just building right now," McCreary said. "We're a few episodes into shooting and they're getting to know each other. They're finding what the quality of the relationship is."

5/

Jackson lost all his money due to a scandal.

Jackson gave up his family fortune.
ABC

In season 14, it's revealed that Jackson Avery's family's foundation buried a sexual assault suit against his late grandfather, Harper Avery.

Panic ensues at the hospital and Catherine, Jackson's mother, thinks the solution is to take all the blame herself. Jackson, however, doesn't agree and comes up with a new plan.

Jackson gave his mother a statement to read to the press, explaining how the foundation is going to support all of Harper Avery's victims by giving them, first, a voice; they vow to re-train and re-hire any woman whose career was derailed by the abuse and reimburse them for damages. The statement goes on to announce the dissolution of the Harper Avery Foundation, and in its place, the formation of the Catherine Fox Foundation.

Jackson even takes it upon himself to pay victims using his own inheritance and personal wealth.

6/

Owen took in a foster baby.

Amelia helps Owen raise the baby.
ABC

Toward the end of last season, Owen Hunt pursued his dream of becoming a father by taking in a foster baby. Amelia Shepard, Owen's ex-girlfriend and Derek Shepard's sister, saw so much of herself in the baby's mother so she took her under her wing. Amelia moves in with Owen to help take care of the baby as a team. Being co-parents just might bring back that flame between Owen and Amelia.

7/

Alex and Jo got married.

Alex and Jo married in season 14 after an on-and-off relationship.
ABC

After years of dating and going back on forth on whether or not they should actually get engaged, Alex and Jo married in season 14.

As the season ends, she and Alex head off for their honeymoon.

In the finale, Jo also considers accepting a fellowship offer in Boston. She tells Alex that she's not ready to be an attending surgeon, despite Meredith offering her a job to keep her at Grey Sloan.

8/

Bailey made the decision to focus on her passions after suffering a heart attack.

Bailey makes some big decisions in season 14.
ABC

In season 14, to fans' surprise, Miranda Bailey suffered a heart attack. While in recovery, she told Ben Warren to pursue his dream of being a firefighter; she also re-evaluated her own career and decided she wanted to pursue her passions, one of which involves teaming up with a sex toy company to make her "Trailblazer" device.

Chandra Wilson, who plays Miranda Bailey, told TVLine: "I'm really excited to be able to incorporate this heart surgery into [my portrayal of] Bailey along with her OCD — because those things don't go away. They will forever change you. I've spoken to heart patients, and they tell me that there's an uber-awareness of what's happening with your body that wasn't there before. It's always there somewhere, brewing."

Bailey also decides at the end of Season 14 that she wants to take a "stress sabatical" from being Chief of Surgery.

It seems fans can expect a lot of changes from Bailey going forward.

9/

A pregnant Teddy returned to Seattle Grace Hospital.

Teddy returned in season 14.
ABC

When Teddy returns unexpectedly to Seattle Grace, she asked Bailey if there are any positions open at the hospital. Bailey offers her the job as interm Chief of Surgery. It remained unclear whether she would accept.

Teddy also revealed that she is pregnant. At the time of her return, she and Owen Hunt weren't a couple. They had broken up after she found out he was sleeping with his ex-wife, Amelia Shepard, right before he slept with her.

This complicates things as fans think Owen's the father, though this hasn't been verified.

10/

Actor Chris Carmack will be joining the cast of "Grey's Anatomy."

There will be a new "ortho god" at Seattle Grace Hospital.
Michael Loccisano/Getty Images

Chris Carmack will join the cast of "Grey's Anatomy" as an "ortho god." Although we don't know his name or many details about him, some fans suspect he could be a match for Meredith.

"I don't know if [he] is Meredith's type, but I think she doesn't know either," co-showrunner Krista Vernoff told TV Guide. "She doesn't know who she is romantically, as this adult woman post-Derek. So, who knows?"